Integrated High-Power DCDC controller

ICsense designed an ASIC that is used in Power-over-Ethernet Powered Devices (PoE-PD), which require high power (40W). The ASIC has a DC-DC converter controller to support a 9V auxiliary supply. One of the key blocks is a PWM controller for DC-DC conversion. The PWM controller is designed for DC-DC conversion under current-mode control and therefore includes a slope compensation technique. The chip supports flyback, buck and forward DC-DC converter topologies. The ASIC is marketed by OnSemi (NCP1083).

Features:

40W PoE powered device (RJ45 connector)

PWM controller for flyback, buck and forward converters

Programmable operational current limit of up to 1100mA for extended power ranges

Adjustable UVL (under voltage lockout)

Programmable inrush current limit

Over temperature protection

Wide duty cycle range with internal slope compensation circuitry

Programmable oscillator frequency

Temperature range of 40°C to 85°C with full operation up to 150°C junction temp